Broom Broom kit

The Broom Broom kit was a broomstick-modifying kit sold at Weasleys' Wizard Wheezes in Diagon Alley. It promised to "bling up your broom" and included a pointed cap for the end of the handle, a pair of fins that slid onto the handle, a tailfin that was attached on top of the bristles, and a rocket booster for the back underside.[1]